Although erase is often used as a synonym for wipe, that term is a little misleading -- it isn't possible to actually erase hard drive data. Deleting a file only removes the file listing, which serves as a shortcut. The data is still on the computer and easily accessible to anyone with the right program and/or know-how.
First developed by Tim Berners-Lee in 1990, HTML is short for HyperText Markup Language. HTML is used to create electronic documents (called pages) that are displayed on the World Wide Web.
HTML and JavaScript are two different things, but they are complimentary. HTML is a markup language designed for defining static web page content. It is what gives a web page its basic structure. JavaScript is a programming language designed for performing dynamic tasks within that page, like animation or a search box. JavaScript is designed to run within the HTML structure of a website and is often used multiple times. If you're writing code, your JavaScript will be more easily accessed if you place them in separate files.